Tehran , Iran -LRB- CNN -RRB- -- The release of American hiker Sarah Shourd has been `` canceled '' because the judicial process has not been completed , a prosecutor said Friday , according to the semiofficial Iranian Labour News Agency .

Iranian officials had said Thursday that Shourd , one of three American hikers held in Iran for more than a year , would be released Saturday .

`` The news -LSB- of the impending release -RSB- is not approved by the judiciary and , naturally , any decision regarding the defendants is contingent upon the completion of the due process , '' said Abas Jafari Dolatabadi , Tehran 's public and revolutionary prosecutor , according to ILNA .

The Islamic Republic News Agency , an official agency of the Iranian government , cited the deputy director of the president 's office of communications as saying that Shourd 's release had only been `` postponed . ''

`` He said more details will be given later , '' it added .

Shourd , 32 , along with Shane Bauer , 28 , and Josh Fattal , 28 , were detained July 31 , 2009 , after they allegedly strayed across an unmarked border into Iran while hiking in Iraq 's Kurdistan region .

Tehran has said the three hikers were spies , and Iran 's intelligence minister has hinted the country may consider releasing them in exchange for the release of Iranian prisoners , according to state news outlets .

Masoud Shafii , the Iranian lawyer who represents the hikers , said he has put in a formal request for the trio 's release within the past two weeks . Shafii said he told prosecutors that a year had passed since their arrests and the government had not shown any just cause for their imprisonment , and that Shourd has a medical condition that requires proper care .

A spokeswoman for the families told CNN that Shourd told her mother during their sole visit , over two days in May , that she had found a lump in her breast .

The hikers ' families ' website , freethehikers.org , said Shourd has been in solitary confinement , able to meet for only two 30-minute periods per day with Bauer , who is her fiancé , and Fattal . The two men share a cell .

The three Americans -- all of them graduates of the University of California , Berkeley -- have not been charged , the website says . They are in Evin Prison in Tehran , have been able to telephone their families only once , on March 9 , and have been denied access to their lawyer , the website adds .

`` Shane , Sarah and Josh care greatly about our world and have a documented record as advocates for social and environmental justice , '' it says . `` They admire and respect different cultures and religions and share a love of travel that has taken them to many countries . That is why they went to Kurdistan , not because they wanted to enter Iran .

`` Their protracted detention without due process is illegal according to international and Iranian law and must end immediately . It is widely acknowledged that they are being held for political purposes that have nothing to do with the facts of their case . Their detention is arbitrary and inhumane and we call on the Iranian authorities to release them without further delay . ''

CNN 's Shirzad Bozorgmehr in Tehran and Mary Snow in New York contributed to this story .

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Prosecutor cites incomplete judicial process

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Shourd is one of 3 American hikers held in Iran for more than a year

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She was to have been released Saturday